It's a Boy's Life: Great Cup-struction. Fun Kids Activity and easy to store afterwards - Building with Red Solo cups - How high with a limited number. Great inexpensive thing to do when traveling to grandparents house.
Balloon Rockets - I've done this in several science camps I've conducted. Kids have fun with it. But, when the balloon deflates it may fall off the straw because it's surface area changes - another good thing to show and explain to kids.
This would be a great activity for an indoor recess. The children could make the ring and decide what the game rules are. Could be adapted to Spanish language lesson.write targrt word or sentence on each ring.